code: def topology(self):
      return VonNeumann
  
file_path: pyswarms/tests/backend/topology/test_von_neumann.py
imports: import numpy
  import pytest
  from pyswarms.backend.topology import VonNeumann
  from .abc_test_topology import ABCTestTopology
label_desc: Use image node_id 1 for calling the TestVonNeumannTopology obj's underlying member method code with example usage: obj.topology() and returns: VonNeumann